判断闰年

#include <stdio.h>int main(){int year,leap;for(year=1000;year<=2000;year++){if(year%4==0){if(year%100==0){if(year%400==0)leap=1;elseleap=0;}elseleap=1;}elseleap=0;if(leap)printf("%d is a leap year ",year); elseprintf("\n",year);}return 0;}